﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StudyLinq
{
    class Program
    {
        static void Main(string[] args)
        {
            StudentClass sc = new StudentClass();
            //sc.QueryHighScores(1, 90);
            sc.QueryAverageScores();
            // Keep the console window open in debug mode.
            Console.WriteLine("Press any key to exit");
            Console.ReadKey();
        }
    }
    public class StudentClass
    {
        #region data
        protected enum GradeLevel { FirstYear = 1, SecondYear, ThirdYear, FourthYear };
        protected class Student
        {
            public string FirstName { get; set; }
            public string LastName { get; set; }
            public int ID { get; set; }
            public GradeLevel Year;
            public List<int> ExamScores;
        }

        protected static List<Student> students = new List<Student>
    {
        new Student {FirstName = "Terry", LastName = "Adams", ID = 120, 
            Year = GradeLevel.SecondYear, 
            ExamScores = new List<int>{ 99, 82, 81, 79}},
        new Student {FirstName = "Fadi", LastName = "Fakhouri", ID = 116, 
            Year = GradeLevel.ThirdYear,
            ExamScores = new List<int>{ 99, 86, 90, 94}},
        new Student {FirstName = "Hanying", LastName = "Feng", ID = 117, 
            Year = GradeLevel.FirstYear, 
            ExamScores = new List<int>{ 93, 92, 80, 87}},
        new Student {FirstName = "Cesar", LastName = "Garcia", ID = 114, 
            Year = GradeLevel.FourthYear,
            ExamScores = new List<int>{ 97, 89, 85, 82}},
        new Student {FirstName = "Debra", LastName = "Garcia", ID = 115, 
            Year = GradeLevel.ThirdYear, 
            ExamScores = new List<int>{ 35, 72, 91, 70}},
        new Student {FirstName = "Hugo", LastName = "Garcia", ID = 118, 
            Year = GradeLevel.SecondYear, 
            ExamScores = new List<int>{ 92, 90, 83, 78}},
        new Student {FirstName = "Sven", LastName = "Mortensen", ID = 113, 
            Year = GradeLevel.FirstYear, 
            ExamScores = new List<int>{ 88, 94, 65, 91}},
        new Student {FirstName = "Claire", LastName = "O'Donnell", ID = 112, 
            Year = GradeLevel.FourthYear, 
            ExamScores = new List<int>{ 75, 84, 91, 39}},
        new Student {FirstName = "Svetlana", LastName = "Omelchenko", ID = 111, 
            Year = GradeLevel.SecondYear, 
            ExamScores = new List<int>{ 97, 92, 81, 60}},
        new Student {FirstName = "Lance", LastName = "Tucker", ID = 119, 
            Year = GradeLevel.ThirdYear, 
            ExamScores = new List<int>{ 68, 79, 88, 92}},
        new Student {FirstName = "Michael", LastName = "Tucker", ID = 122, 
            Year = GradeLevel.FirstYear, 
            ExamScores = new List<int>{ 94, 92, 91, 91}},
        new Student {FirstName = "Eugene", LastName = "Zabokritski", ID = 121,
            Year = GradeLevel.FourthYear, 
            ExamScores = new List<int>{ 96, 85, 91, 60}}
    };
        #endregion

        //Helper method, used in GroupByRange.
        protected static int GetPercentile(Student s)
        {
            double avg = s.ExamScores.Average();
            return avg > 0 ? (int)avg / 10 : 0;
        }

        protected static double GetAverage(Student s)
        {
            return s.ExamScores.Average();
        }

        public void QueryHighScores(int exam, int score)
        {
            var highScores = from student in students
                             where student.ExamScores[exam] > score
                             select new { Name = student.FirstName, Score = student.ExamScores[exam] };

            foreach (var item in highScores)
            {
                Console.WriteLine("{0,-15}{1}", item.Name, item.Score);
            }
        }

        public void QueryAverageScores()
        {
            var avgScores = from student in students
                            let a = new
                            {
                                Name = student.FirstName,
                                Score = GetAverage(student)
                            }
                            orderby a.Score
                            select a;

            foreach (var item in avgScores)
            {
                Console.WriteLine("{0,-15}{1}", item.Name, item.Score);
            }
        }
    }
}
